Convert the "Rust for C++ programmers" wiki page into a C/C++ migration/comparison guide

[huonw]

https://github.com/mozilla/rust/wiki/Rust-for-CXX-programmers

[huonw]

cc @brson, is this a good idea?

[brson]

What are some specifics that would need to change as a migration and comparison guide?

The guide does need updating otherwise though: it's still talking about @.

[brson]

This seems like something that could be move in-tree, once we're happy with it.

[steveklabnik]

http://www.reddit.com/r/rust/comments/2dmzf6/why_do_equality_tests_of_references_seem_to/ should be added to this.

[steveklabnik]

Due to #5831 (comment), we cannot use this, so I'm going to give this a close.